Light-Stimulated Composition Conversion in TiO2-Based Nanofibers
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- 作者：Ming Jin ; Xintong Zhang ; Shunsuke Nishimoto ; Zhaoyue Liu ; Donald A. Tryk ; Alexei V. Emeline ; Taketoshi Murakami ; Akira Fujishima
- 刊名：Journal of Physical Chemistry C
- 出版年：2007
- 出版时间：January 18, 2007
- 年：2007
- 卷：111
- 期：2
- 页码：658 - 665
- 全文大小：772K
- 年卷期：v.111,no.2(January 18, 2007)
- ISSN：1932-7455
文摘
Silver-TiO2 nanofibers (Ag/Ti = 1/50) were fabricated by the electrospinning method, followed by heattreatment at 200 
C and calcination at 550 C. The electrospinning solution was comprised of AgNO3 andtitanium tetraisopropoxide (TTIP) with polyvinylpyrrolidone (PVP). Alternating irradiation of the silver-TiO2 nanofibers with ultraviolet and visible light can interconvert the silver species on the TiO2-based nanofibersto yield Ag metal and Ag2O, respectively, and this process has been characterized by UV-visible spectra,TEM, XRD, and XPS. The interconversion process can be rationalized in terms of the photoreduction ofAg2O by TiO2 and the oxidization of Ag by visible light. Acetaldehyde photodecomposition measurementsindicate that Ag2O has better mineralization ability than Ag0 in this kind of silver-TiO2 nanofiber photocatalyticsystem. The photoinduced conversion of composition on TiO2-based nanofibers may find applications inphotocatalysis, antibacterial technology, and other areas.
C and calcination at 550 C. The electrospinning solution was comprised of AgNO3 andtitanium tetraisopropoxide (TTIP) with polyvinylpyrrolidone (PVP). Alternating irradiation of the silver-TiO2 nanofibers with ultraviolet and visible light can interconvert the silver species on the TiO2-based nanofibersto yield Ag metal and Ag2O, respectively, and this process has been characterized by UV-visible spectra,TEM, XRD, and XPS. The interconversion process can be rationalized in terms of the photoreduction ofAg2O by TiO2 and the oxidization of Ag by visible light. Acetaldehyde photodecomposition measurementsindicate that Ag2O has better mineralization ability than Ag0 in this kind of silver-TiO2 nanofiber photocatalyticsystem. The photoinduced conversion of composition on TiO2-based nanofibers may find applications inphotocatalysis, antibacterial technology, and other areas.